body {
  overflow: hidden;
  .login_box {
    width: 300px;
    margin: 200px auto 0;
    .login_btn {
      width: 100%;
      margin-bottom: 10px;
    }
    .entrance {
      display: flex;
      justify-content: space-between;
    }
    .isUse {
      position: absolute;
      right: 0;
    }
  }
}
